Nearly three dozen migrants marched across the U.S.-Mexico border without papers Monday, the latest group of a younger generation brought to the U.S. illegally as children that seeks to confront head-on immigration policies they consider unjust.

With immigration legislation stalled in Congress, advocates are intensifying pressure on the Obama administration to act unilaterally to stop deportations or grant legal status to some of the 11 million people now living in the U.S. illegally.

Many House Republicans say people who illegally crossed the border or overstayed their visas should not be rewarded with a special, tailor-made solution that awards them a prize of American citizenship, especially when millions are waiting in line to attempt the process through current legal channels.

Florida Republican Sen. Marco Rubio is warning that if Congress doesn't pass immigration overhaul legislation, President Barack Obama may act on his own to legalize the 11 million immigrants already in the country illegally.

Sens. Tom Harkin of Iowa and Dick Durbin of Illinois say they'll hold a forum on immigration in the home district of Iowa Republican congressman Steve King to pressure him in the wake of incendiary comments he made on immigrant youths.

As Congress debates immigration legislation, members of the House and Senate embark Thursday on a weekend tour of immigration-related sites in New York City, with stops at Ellis Island and at a naturalization ceremony.

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